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Q.

Calculate the work done in blowing a soap bubble of radius 2cm surface tension of soap solution  =7×10−2N/m

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a

7.04×10−4J

b

7.04×10−3J

c

7.04×10−2J

d

7.04×10−1J

answer is C.

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Detailed Solution

work done (w)=8πr2T=8×227×(2×10−2)2×7×10−2=7.04×10−1J

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